基于数字电容式的传感器接口电路设计Design of interface circuit for digital capacitive sensor
肖莹慧
摘要(Abstract)：
为了降低无源RFID传感器标签的功耗和面积,设计一种基于无源RFID数字电容式传感器的接口电路。其采用0.18μm CMOS工艺设计的集成式全数字结构,能够在频域内对传感器电容值进行处理。该电路采用一种功耗比传统反相器结构振荡器低30%的新型环形振荡器结构,振荡器内部是限幅的。最后,对该集成全数字电路进行测试。测试结果表明,其线性度与稳定性均良好,芯片占用面积小,仅为0.21 mm2,且功率消耗小,在电源电压下仅为0.92μW。因此,适合应用于无源RFID传感器标签设计中。
关键词(KeyWords)： 数字电容式传感器;接口电路;无源RFID;CMOS工艺;环形振荡器;标签设计
基金项目(Foundation): 中国博士后科学基金项目(2015T80797)~~
作者(Author): 肖莹慧
DOI: 10.16652/j.issn.1004-373x.2018.18.010
参考文献(References)：
- [1]郑志霞,冯勇建.MEMS接触电容式高温压力传感器的温度效应[J].电子测量与仪器学报,2013,27(12):1141-1147.ZHENG Zhixia,FENG Yongjian.Temperature effect of MEMS high temperature touch-mode capacitive pressure sensor[J].Journal of electronic measurement and instrumentation,2013,27(12):1141-1147.
- [2]LI B,HE Y,ZUO L,et al.Metric of the application environment impact to the passive UHF RFID system[J].IEEE transactions on instrumentation and measurement,2014,63(10):2387-2395.
- [3]罗毅,施云波,杨昆,等.用于探空仪的加热式湿度传感器及测量电路[J].光学精密工程,2014,22(11):3050-3060.LUO Yi,SHI Yunbo,YANG Kun,et al.Humidity sensor for radiosonde and its measuring circuit[J].Optics and precision engineering,2014,22(11):3050-3060.
- [4]佐磊,何怡刚,李兵,等.无源超高频射频识别系统路径损耗研究[J].物理学报,2013,62(14):142-149.ZUO Lei,HE Yigang,LI Bing,et al.Analysis and measurements of path loss effects for ultra high frequency radio-frequency identification in real environments[J].Acta Physica Sinica,2013,62(14):142-149.
- [5]司禹,冯鹏,于双铭,等.基于无源超高频RFID温度标签的温度监测系统[J].传感器与微系统,2017,36(1):78-80.SI Yu,FENG Peng,YU Shuangming,et al.Temperature monitoring system based on passive UHF RFID temperature tag[J].Transducer and microsystem technologies,2017,36(1):78-80.
- [6]熊昕.RFID读写器与MIFARE1卡通讯测试实验设计[J].信息技术与信息化,2015(8):183-185.XIONG Xin.RFID reader and MIFARE1 card communication test design[J].Information technology and informatization,2015(8):183-185.
- [7]夏宏,吴济文.超高频RFID读写器系统的设计与实现[J].计算机应用,2012,32(8):2369-2373.XIA Hong,WU Jiwen.Design and implementation of ultra high frequency RFID reader system[J].Journal of computer applications,2012,32(8):2369-2373.
- [8]蒋天齐,洪涛,余忠华,等.PCB集成化RFID在电能表智能制造中的研究应用[J].计算机测量与控制,2017(2):234-237.JIANG Tianqi,HONG Tao,YU Zhonghua,et al.Application and research of energy meter intelligent manufacture based on PCB integrated RFID[J].Computer measurement&control,2017(2):234-237.
- [9]王阳,陈军宁,胡江,等.低压低功耗CMOS微电容式传感器数字型接口电路研究[J].传感技术学报,2015,28(2):198-204.WANG Yang,CHEN Junning,HU Jiang,et al.Research on digital interface circuit for CMOS micro-capacitive sensor with low-voltage supply and low-power consumption[J].Chinese journal of sensors and actuators,2015,28(2):198-204.
- [10]AZARMEHR M,RASHIDZADEH R,AHMADI M.Low-power oscillator for passive radio frequency identification transponders[J].IET circuits,devices&systems,2012,6(2):79-84.
- [11]XIA S,MAKINWA K,NIHTIANOV S.A capacitance-to-digital converter for displacement sensing with 17b resolution and20μs conversion time[C]//Proceedings of IEEE International Solid-State Circuits Conference.San Francisco:IEEE,2012:198-200.
- [12]TAN Z,DAAMEN R,HUMBERT A,et al.A 1.2-V 8.3-n J CMOS humidity sensor for RFID applications[J].IEEE journal of solid-state circuits,2013,48(10):2469-2477.
- [13]NGUYEN T T,H?FLIGER P.An energy efficient inverter based readout circuit for capacitive sensor[C]//Proceedings of IEEE Biomedical Circuits and Systems Conference.Rotterdam:IEEE,2013:326-329.